Pump.



P. G. TEUFL.

PUMP. l APPLICATION FILED APEL'IB, 1913. y

Patented Sept. 29, 1914.

o e ee anni E 3 Franz Car` [DSW Inventor- Teufl His oflttorngy FRANZcant TEUFL, or oiL CITY, PENNSYLVANIA, AssieNon To oFFioE.

GENERAL ELECTRIC COMPANY, 'A CGRPORATION OF NEW YORK.

PUMP.

Specieation or Letters Patenti PatentedSept'. 29, 1914.

appiicaariaiea apra is, isis. serial No. reims.

T all whom. it may concern.Y

Be it known that I, FRANZ CARL TE'UFL, a subject of the `Emperor otAustria-Hungary, residing at Oil City., county of Venango, State ofPennsylvania, have invented certain new and useful Improvements 1nPumps, of which the following is a specification.

The present invention relates to pumps and more especially to pumps forsupplying fuel under high pressure to internal cornbustion enginesoperating on the high com` pression plan.

The object of my invention is to provide f a pump of improvedconstruction, and for a consideration of what I believe to be novel andmy invention attention is directed to the I accompanying description andclaims zippended thereto.

In the accompanying drawing, which is illustrative of my invention,Figure 1 is a view in side elevation of an internal conibustion engineequipped with lmy improved I pump; Fig. 2 is a longitudinal section ofthe pump; Fig. 3 is a transverse section through the means for actuatingthe cut-ol l valve, and Figs. 4, 5 and G are detailed views lillustrating the different positions of the! cutoff valve underdifferent conditions of load. l

Fig. 1 illustrates an engine of any suitable construction comprising a.base l0 and a main crank shaft 11. On top ot the base is a cylinder 12containing a piston which is .l connected to the main shaft in theordinary l way. I have shown only one cylinder, but it is to beunderstood that as many cylinders may be provided as are desired. l mayuse one pump i'ior all oiu the cylinders, but prefer` ably a pump isprovided tor each cylinder. Mounted in the head of the cylinder is a.sprayer or fuel injector 13 of any suitable construction. Fuel is or maybe injected from the sprayer to the cylinder by compressed air admittedto the ipc 14 from any suitable source of supply. llfor simplicity Ihave omitted the fuel valve and its actuator. 15 indicates the stem ofthe exhaust valve which is actuated by a rocker arm 1 6 from the haltspeed cam shaft 17 in the usual way. 18 indicates a conduit for carryingol the Iexhaust gases. The cam shaft 17 is mounted in bearings carriedby brackets attached to the hase of the engine. T he bracket alsolsupports the cylinder 19 oi is puni p. Situated in back of the pumpcylinder is a rertical shaft 20 that `is driven by the cam shaft. On theupper end ofthisfshaft is a speed governor 2l of any suitableconstruction. 22 indicates the sliding collar of the speed governor`whicliis moved up and down by the governor Weights as the speed oftheengine changes. 23 indicates a governor lcver which is connected tothecutoff valve of the pump as will be described more fully hereinafter.

Referring to Fig. 2, 19 indica tes the pump cylinder and located thereinis ahollow pliniger 24 which has one or more ports 25 and a seat 26 forthe cutoff valve 27. Just above the seat are one or more ports 28 in theplunger which communicate .with the pump chamber 29. Surroundingtheupper end ot .the stein of valve 27 is a collar 30 in which the valve isfree to slide. The collar limits the downward movement of the cutoitl'lvalve, but has no eiiect upon its upward movement. The position of thecollar' is determined by the speed governor acting through a forked arm3l which is mounted on the rock shaft 32. rlhe rock shaft is mounted inhearings in the pump casing or cylinder and is suitably packed toprevent leakage; On one end of the rock shaft is an arm that isconnected by the rod 36 with the governor actuated lever 23. As thespeed of the engine changes the collar is moved up or down and theperiod of closing of the cutol'l' valve is, theretore, changed. lv inavdepend upon gravity to close the valve 27 or tlie actionof gravity maybe supplenici'itcd by a light: compression spring" 37. Mounted on topoi" the pump cylindcris a litting contuining' an overflow or reliefvalve 3S which is normally held against its seat by a Sliding member39,:ind a relatively stiff and adjustable spring L10. When the valve isopened by reason of a. predetermined pressure in the chamber 29, as itis on each Working stroke of the plunger 24, the r\'l.ess fuel escapesby the pipe 41 back to the tank or other source of supply. lhclower `ndof the plunger is provided with ing 42, and is actuated by crank 48mounted on the cain shaft 17 and by a connecting rod 44.. 45 indicates aball suction valve and 46 a ball discharge valve. Leading to the suctionvalve is a conduit that uy suitable paek-` an eccentric orI be arrangedto feed fuel by gravity to 'the pump. 48 indicates a assage that is incommumcation with the all valves and with the port or portslin the pumpplunger. Surrounding the plunger in the region of movement of the ports25 and .separated therefrom by a space,.is a gland 49 containingorifices 50 through which uel'enters the plunger .on the suction strokeand is discharged therefrom on the working stroke. Above and below thef' gland are disks 51 which are steated on packing material surroundingthe plunger and serve to hold the gland in place.

The action of my improved pump is as follows: As t-he plunger movesdownwardly from the inner endl of its stroke the cutoff valve 27 isopened by the pressure difference acting on opposite sides thereof. This1s dile to t e fact that as soon as the plunger starts'to movedownwardly it increases the cubical 'contents of the pump chamber 29,

thereby tending to createv a vacuum there- 1n. the plunger-more or lessclosely due to the u. action of gravity `and spring 3.7 until the valve-4.5 closes and the flui the plunger is forced downward through.

shoulder on its upper end strikes the collar -30 whose position is.'determined by the overnor. As soon as the valve opens,

uid from the" source of supply iiows past the suctlon valve into thepassage48 and orifices through the port 25'into the plunger and into thechamber 29 through ports 28..

This action continues until the plunger reaches its lowest position. Onthe upward or working stroke of the plun er the suction displaced by theinterior of the plunger and p'ort or ports 25 into thepassage-48,.th.ence past the valve 46.into the pipe 47, from which itflows to the sprayer or injector 13. This action continues until theseat 26 on the plunger engages thelower end of the. cuto valve 27. Assoon as this happens'thesupply of fuel to the engine is cut od. Sincethis closing of the valve take place before the-end of theplungerstroke, it. follows that'means must be provided to take care of theexcess fuel discharged by tlu` pump. Such a means found inthe over-Howof relief valve 3S that opens in response to pressure in. 'the pumpchamber 29 and discharges the excess through thepipe 41to .the tank orother source of supply.l It will we noted'th'at the pump begins todeliver iiel at the same point on each stroke, z'. e., at the-beginningthereof, and that the termination of the efective ump 'stroke is.regulated by the seating o the cutoff valve 27 whichmay be 'itpermits-the use' of a smal The valve 27 follows the movement 0j'governor belng required only .toovercomev earlier or later, dependingupon the load on the engine. The time of closing of the valve isdetermined by the position of the collar 30, the latter' being set bythe action of the speed governor 21.

I In Fig. 4 is shown the 4relation of the arts lwhen theI engine isoperatinfr under full load conditions; that is `to say, tlie valve 27does not close until nearly the end of the working stroke of thelunffer.

Fig. 5 is a similar view schowing the position that the valve occupiesfor partial loads,-say one-half load for example.

In Fig. 6 is shown the relation of the valve when the engine isoperating under li'ht load conditions; that is to say, the time oclosingl of the cutoff valve 27 with respect to t e stroke of theplunger is earlier. The effect of this of course is to decrease theamount of fuel supplied to the engine.

MyA improved pump mechanism has the advantage that the amountof fuelrequired by the engine is regulated by the action of the'plungerandthe'cutott valve 27. Also thatin'the operation of the pump there isno force applied to, or reaction 4upon the governor parts.v This isimportant because governor, said the friction on the rock shaft 32 andits stulingboxes. The overflow or relief valve '38 discharges all of theexcess fuel not rethe engine. The opening or clos- Hin'g of t is. valveearlier or later with required b spect to the plunger stroke' dependsupon t e time of closing of the cutoif valve 27. That,is to sa when thevalve 27l closes earlier, the va ve 38 will open earlier and hence agreater' amount' ofjfuel will be returned to the supply tank through thepipe 41. Conversely'alater closing of the valve 27 will mean 'a lateropening of valve 38 and hence less fuel will-.be returned to the tank.This arrangement also has the advantage that' the pump will be cleaned.on each disgases instead of being trapped in the pump chamber will becarried off with the fuel through the pipe41. The parts are s de signedthat even atmaximum overload there 'will be a certain small amount offuel pass through the valve 38. .It will be also noted that the time orbeginning of the discharge stroke of the pump is invariable, and that itis absolutely independent of the speed governor. Furthermore, it will benoted that the adjustment of the cutoff .valve 27 is determined by thespeed governor and is not dependent upon theI position of 'the plunger.

The feature of havingthe plunger begin .110 charge stroke, and henceany'alr or foreign' to discharge fuel at the same period orportion'ofitsworking stroke under all conditlons 1s of particularimportance where the pump is provided with a number of plungers, eachsupplying fuel to its own injector, said injectors being in differentengine cylinders. In othei` words all of the injectors will begin toreceive fuel at the same instant, and hence the proper relation betweenthe parts can be determined with accuracy.

.ln accordance with the provisions of the patent statutes, I havedescribed the prnthe cylinder and thek disciarge therefrom,

and a valve located in the cylinder that ceoperates with the plunger tocut olf the discharge of fluid from the cylinder.

2. In a pump. the combination of a cylinder, a hollow plunger therefor,an actuator for the plunger, conduits conveying fluid to the cylinderand the discharge therefrom, a valve located in the cylinder thatcooperates with the plunger to cut. eff the discharge of fluid from thecylinder, and an overflow valve which opens after the cut-off valve isseated.

3. ln a pump, the combination of a cylinder, a hollow plunger having aninlet port and a valve seat, an actuatorl for the pluncjer, conduitsconveying Huid to the cylinder and the discharge therefrom, a valvelocated in the cylinder which engages said seat at some portion of theplunger stroke 'to out off' the-discharge from the cylinder, and meansfor determining the time of closing; of the cutoff valve with respect tothe stroke ot' the plunger.

fl. In a. pump, the combination of a cylinder, a hollen7 plungertherefor through which `Huid passes from the cylinder on its dischargestroke, an actuator for the plunger, eoinluits conveying fluid to thecylinder and the dis( h: rge therefrom, a valve located in. the cylinderwhich cooperates with the plunger to cut ott the discharge of fluid fromthe cylinder, and means for adjusting the valve to determine the time ofclosure thereof and regulate the amol'lnt of fluid discharged on eachplunger stroke.

5. ln a pump, the combination of a Cylinder, suction and dischargevalves therefor, a hollow plunger, an actuator for the plunger, a cutoffvalve that cooperates with the plunger to determine the amount of fluiddeliv ered on each plunger stroke, means for determinino the time ofclosing of the cutoff valve, and a pressure actuated relief valve thatopens to relieve the cylinder of. fluid as the plunger continues itsstroke after the cutoftl valveis seated.

(l. ln aA pump, the combination of a cylinder. suction and dischargevalves therefor, a hollow plurt'erthat has -aport at rone end and a.valve seat at the other, an actuator therefor, a cut-olf valve thatenters and is guided by the wall of the plunger and en- 4cantes lsaidseat to cutoff the d;-'ch-ir;;re of fluid from the inside of the plungerto the discharge valve, a means zur. adjusting the cutoff valve, and apressure actuated relief valve.

f7. In a pump` the combi lation of a cylinder, a. hollow plungertherefor, an actuator for the plunger, conduits con veyii'ng' fluid toand from the cylinder, a valvelocatcu 'in the cylinder that i-opcrateswith the plunger to determine thc point of cut-off, and a speed governorthat adjusts the valve.

8. The combination with an internal co1nbustionengrinc of a fuel pumptherefor comprising a cylinder, a hollow plunger, an actuator for theplunger, -.on(luits conveying; fuel to and from the cylinder, inlet andoutletvalves in the conduits, a valve in the cylinder that seats on theplunger to determine the point of cubed, a relief valve that opens afterthe cutoii' valve closes, and a speed governor driven by the enginethatregulates the closing of the cut-olf valve.

S). The combination of an internal com liustion engine with a fuel pumptherefor comprising' a cylinder, suction and discharge valves therefor,a hollov plunger in, the cyl.- inder which begins to deliver fuelthrough the discharge valve at the same period on each 'working stroke,an actuator for the plunger which imparts to it a stroke of constantlength and in the same region, a cutelf valve located in the cylinderwhich is seated on the plunger at each Working stroke, means foradjusting the position of the valve within the cylinder so that it Willbe seated earlier or later, and means receiving fuel from the pumpduring the working stroke and after the cutoff valve is seated.

10. In a pump, the combination of a cylinder, a plunger therefor, anactuator for the plunger, inlet and outlet passages for conveying fluidto and from the cylinder, I

suction and discharge valves in said passages controlling the flow offluid therethrough, valve means located in said chamber and controlledby the plunger for eutting olf communication between the chamber and theoutlet passage, and means for receiving' the fluid displaced after saidValve means has closed.

1'1. In a pump, the combination of a cylinder having a pump chambertherein, a plunger therefor, an actuator for the lunger, conduits havingsuction and disc large valves therein, said plunger having a pas sagetherethrough which connects said con-l duits with the pump chamber, anda valve for closing 'said passage to control the quantit-y of fluiddelivered by the pump.

12. In apump, the combination of a cylinder having a pump chambertherein, a

plunger therefor, an actuator for the plunger, conduits havingsuction'and discharge inder having a pump chamber therein, a

plunger therefor, -said plunger having a passage therethrough Whichcommunicates with the chamber, suction and discharge conduits whichcommunicate with the chamber through said passage, a valve seat on theplunger, a valve in they chamber which engages the seat to cut offcommunication between the conduits and the chamber, and means for movingthe valve relative to the seat to vary the time of closing.

14. In a pump, the combination of a cylinder having a pump chambertherein, a plunger therefor, said plunger having a passage therethroughwhich communicates With the chamber, suction and discharge conduitswhich communicate with the chamber through said passage, a valve seat onthe plunger, a yieldingly supported valve in the chamber which engagesthe seat to cut O communication between the conduits and the chamber,said valve being biased toward said seat, and an adjustable stop forlimiting the movement of the valve toward the seat.

In Witness whereof, I have hereunto set my hand this tenth day of April,1913.

FRANZ CARL TEUFL.

Witnesses:

' WM. H. WEIGLE, N. A. NEWTON.

